Both of these are really, really cute, though I like the first one best!

The trouble with asymmetry is that your creation still needs balance! The heaviest bit of your necklace needs to be at the front, so perhaps some big black glass beads in the front would help. You could alternate them with the smaller ones or just do a row of them followed by the smaller ones - I think either way would look good. Faceted beads, if you can find them big and heavy enough, are very 20s and would make a nice contrast with the round beads. (Or maybe I am just obsessed with sparkle ) Just put enough in to hold the pendant where you want it